5471f55f00
Similar to AArch64 the Arm implementation of 128-bit atomics is broken. For 128-bit atomics we rely on pthread barriers to correct guard the address in the pointer to get correct memory ordering. However for 128-bit atomics the address under the lock is different from the original pointer. This means that one of the values under the atomic operation is not protected properly and so we fail during when the user has requested sequential consistency as there's no barrier to enforce this requirement. As such users have resorted to adding an #ifdef GCC <emit barrier> #endif around the use of these atomics. This corrects the issue by issuing a barrier only when __ATOMIC_SEQ_CST was requested. I have hand verified that the barriers are inserted for atomic seq cst. libatomic/ChangeLog: PR target/102218 * config/arm/host-config.h (pre_seq_barrier, post_seq_barrier, pre_post_seq_barrier): Require barrier on __ATOMIC_SEQ_CST. |
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fixincludes | ||
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intl | ||
libada | ||
libatomic | ||
libbacktrace | ||
libcc1 | ||
libcody | ||
libcpp | ||
libdecnumber | ||
libffi | ||
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libobjc | ||
liboffloadmic | ||
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libquadmath | ||
libsanitizer | ||
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README
This directory contains the GNU Compiler Collection (GCC). The GNU Compiler Collection is free software. See the files whose names start with COPYING for copying permission. The manuals, and some of the runtime libraries, are under different terms; see the individual source files for details. The directory INSTALL contains copies of the installation information as HTML and plain text. The source of this information is gcc/doc/install.texi. The installation information includes details of what is included in the GCC sources and what files GCC installs. See the file gcc/doc/gcc.texi (together with other files that it includes) for usage and porting information. An online readable version of the manual is in the files gcc/doc/gcc.info*. See http://gcc.gnu.org/bugs/ for how to report bugs usefully. Copyright years on GCC source files may be listed using range notation, e.g., 1987-2012, indicating that every year in the range, inclusive, is a copyrightable year that could otherwise be listed individually.